Hey Guys, here is pH (Pedro Henrique Franceschi). Today, I developed a tool to Downgrade your iPhone Baseband from 02.30.03 to 02.28.00 based on GeoHot’s method. The tool is called pHaseBanDowngrader and works great. You may need to downgrade your baseband to use Yellow Sn0w to unlock. As you may know, YellowSn0w only works on 2.28 baseband. Previously, those of you that upgraded to 2.2.1 could not use YellowSn0w. Now you can.

Okay, here is some simple instructions about how to use it:

1. Download the .zip in the end of the post.
2. SSH into your iPhone and put the downloaded folder (phasebandowngrader) inside the folder /Applications/.
3. In MobileTerminal.app, type “login” and enter “root” as user, the default password is “alpine”.
4. Now, type “cd /Applications/phasebandowngrader && ./phasebandowngrader”. Follow the screen instructions.
5. Enjoy!

Many guys from irc.osx86.org had tested it and they are loving the downgraded iPhone. To use that tool, you need to have an iPhone with the Bootloader 5.8. If your iPhone was manufactured before September 2008, you are 5.8. If your device is 2.2.1 OOB (Out Of Box), you can’t downgrade the Baseband because you have bootloader 5.9.

If you want to know what is your Bootloader version, check this link in TheiPhoneWiki.org. Also, read the README that is in the .zip.

Click here to Download pHaseBanDowngrader 1.0 for iPhone 3G!

Enjoy, :D !

Bye!

PS: I’ll work with BigBoss in a GUI version of this tool, but you can use this for now, :) .